CATALYTIC MEMBRANE REACTOR WITH TWO COMPONENT THREE-DIMENSIONAL CATALYSIS

摘要

This invention relates to catalytic reactor membranes having a gas-impermeable membrane (2) for transport of oxygen anions. The membrane (2) has an oxidation surface and a reduction surface. The membrane (2) is coated on its oxidation surface with an adherent catalyst layer and is optionally coated on its reduction surface with a catalyst that promotes reduction of an oxygen-containing species (e.g., O2, NO2, SO2, etc.) to generate oxygen anions on the membrane. The reactor (20) has an oxidation zone (4) and a reduction zone (6) separated by the membrane (2). A component of an oxygen-containing gas in the reduction zone (6) is reduced at the membrane (2) and a reduced species in a reactant gas in the oxidation zone (4) of the reactor is oxidized. The reactor (20) optionally contains a three-dimensional catalyst (5) in the oxidation zone (4). The adherent catalyst layer and the three-dimensional catalyst (5) are selected to promote a desired oxidation reaction, particularly a partial oxidation of a hydrocarbon. Preferred membrane materials of this invention are mixed metal oxides which are derived from brownmillerite and can, themselves, have brownmillerite structure. In a preferred embodiment, the oxygen reduction catalyst is Pd (5 wt. %) on La0.8Sr0.2CoO3-x. The adherent catalyst layer is Ni (20 wt. %) on La0.8Sr0.2MnO3 and the three-dimensional catalyst is Ni (5 wt. %) on alumina.